ZyXEL P-2602HW-D3A User Guide - Page 369
Advanced Encryption Standard AES, Message Integrity Check MIC and IEEE 802.1x.
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P-2602H(W)(L)-DxA Series User's Guide For added security, certificate-based authentications (EAP-TLS, EAP-TTLS and PEAP) use dynamic keys for data encryption. They are often deployed in corporate environments, but for public deployment, a simple user name and password pair is more practical. The following table is a comparison of the features of authentication types. Table 148 Comparison of EAP Authentication Types Mutual Authentication Certificate - Client Certificate - Server Dynamic Key Exchange Credential Integrity Deployment Difficulty Client Identity Protection EAP-MD5 No No No No None Easy No EAP-TLS Yes Yes Yes Yes Strong Hard No EAP-TTLS Yes Optional Yes Yes Strong Moderate Yes PEAP Yes Optional Yes Yes Strong Moderate Yes LEAP Yes No No Yes Moderate Moderate No WPA User Authentication WPA applies IEEE 802.1x and Extensible Authentication Protocol (EAP) to authenticate wireless stations using an external RADIUS database. Encryption WPA improves data encryption by using Temporal Key Integrity Protocol (TKIP) or Advanced Encryption Standard (AES), Message Integrity Check (MIC) and IEEE 802.1x. TKIP uses 128-bit keys that are dynamically generated and distributed by the authentication server. It includes a per-packet key mixing function, a Message Integrity Check (MIC) named Michael, an extended initialization vector (IV) with sequencing rules, and a re-keying mechanism. TKIP regularly changes and rotates the encryption keys so that the same encryption key is never used twice. The RADIUS server distributes a Pairwise Master Key (PMK) key to the AP that then sets up a key hierarchy and management system, using the PMK to dynamically generate unique data encryption keys to encrypt every data packet that is wirelessly communicated between the AP and the wireless stations. This all happens in the background automatically. AES (Advanced Encryption Standard) also uses a secret key. This implementation of AES applies a 128-bit key to 128-bit blocks of data. Appendix E Wireless LANs 369